/* Structural layout: reset, page shell, header, footer, typography rhythm.
   Values consume tokens only — no hardcoded hex/px here. */

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
}

html {
  transition:
    background var(--dur-slow) var(--ease),
    color var(--dur-slow) var(--ease);
}

body {
  background: var(--surface-0);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  display: flex;
  flex-direction: column;
  min-height: 100%;
}

/* --- Header ---------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  height: var(--topbar-h);
  padding: 0 var(--s-5);
  background: var(--surface-0);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-4);
}

.site-header .site-logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: var(--ls-heading);
  color: var(--text);
  text-decoration: none;
  line-height: 1;
  padding: var(--s-1);
}

.site-header .site-logo:hover {
  color: var(--text);
}

.site-header .site-logo sup {
  font-size: 0.7em;
}

.site-header .site-nav {
  display: flex;
  align-items: center;
  gap: var(--s-1);
  margin-left: auto;
  margin-right: var(--s-3);
}

/* Hamburger — hidden above the mobile breakpoint. See the mobile media query
   below for the open/closed behavior. */
.site-header .site-nav-toggle {
  display: none;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius);
  color: var(--text);
  cursor: pointer;
  padding: 0;
  margin-left: auto;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.site-header .site-nav-toggle:hover {
  background: var(--surface-hover);
}
.site-header .site-nav-toggle-bars,
.site-header .site-nav-toggle-bars::before,
.site-header .site-nav-toggle-bars::after {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  transition: transform var(--dur-med) var(--ease),
              opacity var(--dur-fast) var(--ease);
}
.site-header .site-nav-toggle-bars {
  position: relative;
}
.site-header .site-nav-toggle-bars::before,
.site-header .site-nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
}
.site-header .site-nav-toggle-bars::before { top: -6px; }
.site-header .site-nav-toggle-bars::after  { top:  6px; }
.site-header .site-nav-toggle[aria-expanded="true"] .site-nav-toggle-bars {
  transform: rotate(45deg);
}
.site-header .site-nav-toggle[aria-expanded="true"] .site-nav-toggle-bars::before {
  transform: translate(0, 6px) rotate(90deg);
}
.site-header .site-nav-toggle[aria-expanded="true"] .site-nav-toggle-bars::after {
  opacity: 0;
}

.site-header .site-nav a {
  padding: var(--s-1) var(--s-3);
  color: var(--text-muted);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
  font-size: var(--fs-body);
}

.site-header .site-nav a:hover {
  color: var(--text);
  background: var(--surface-hover);
}

.site-header .site-nav a[aria-current="page"] {
  color: var(--text);
  font-weight: 500;
  position: relative;
}

.site-header .site-nav a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: var(--s-3);
  right: var(--s-3);
  bottom: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

/* Theme toggle button: 32x32 square, neutral disc glyph via ::before that
   adapts per data-theme. Visible in all three themes. */
.theme-toggle {
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius);
  color: var(--text-muted);
  cursor: pointer;
  font: inherit;
  transition:
    color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    background var(--dur) var(--ease);
}

.theme-toggle:hover {
  color: var(--text);
  background: var(--surface-hover);
}

.theme-toggle::before {
  content: "\25D1"; /* half-filled circle — theme-agnostic glyph */
  font-size: 16px;
  line-height: 1;
}

[data-theme="dark"] .theme-toggle::before {
  content: "\263D"; /* moon */
}

[data-theme="parchment"] .theme-toggle::before {
  content: "\2750"; /* page glyph */
}

/* --- Main content ---------------------------------------------------- */

main.content {
  flex: 1 1 auto;
  width: 100%;
  max-width: var(--content-text);
  margin: 0 auto;
  padding: var(--s-7) var(--s-5);
}

main.content.wide {
  max-width: var(--content-mixed);
}

/* Headings use the display serif. */
main h1,
main h2,
main h3 {
  font-family: var(--font-display);
  letter-spacing: var(--ls-heading);
  line-height: var(--lh-heading);
  color: var(--text);
}

main h1 {
  font-size: var(--fs-h1);
  font-weight: 700;
  margin: var(--s-7) 0 var(--s-4);
}

main h2 {
  font-size: var(--fs-h2);
  font-weight: 600;
  margin: var(--s-6) 0 var(--s-3);
}

main h3 {
  font-size: var(--fs-h3);
  font-weight: 600;
  margin: var(--s-5) 0 var(--s-2);
}

main p {
  margin-block: var(--s-4);
  max-width: 68ch;
}

main a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

/* Images are fluid by default. */
img {
  max-width: 100%;
  height: auto;
}

/* Align attribute support for raw-HTML resume content. */
[align="center"] { text-align: center; }
[align="right"]  { text-align: right;  }
[align="left"]   { text-align: left;   }

/* --- Footer ---------------------------------------------------------- */

.site-footer {
  border-top: 1px solid var(--border);
  padding: var(--s-5);
  color: var(--text-muted);
  font-size: var(--fs-caption);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--s-4);
}

.site-footer ul {
  list-style: none;
  display: flex;
  gap: var(--s-3);
}

.site-footer a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.site-footer a:hover {
  color: var(--text);
}

/* --- Mobile ---------------------------------------------------------- */

@media (max-width: 640px) {
  main.content {
    padding: var(--s-5) var(--s-4);
  }

  .site-header {
    padding: 0 var(--s-4);
    gap: var(--s-2);
    position: relative; /* anchor the absolute-positioned open menu */
  }

  /* Show the hamburger; it takes over margin-left:auto from .site-nav */
  .site-header .site-nav-toggle {
    display: inline-flex;
  }

  /* Nav collapses into a drop-down panel that appears when the toggle
     is aria-expanded="true". Closed by default. */
  .site-header .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    right: var(--s-3);
    left: var(--s-3);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin: var(--s-2) 0 0;
    padding: var(--s-2);
    background: var(--surface-0);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 24px var(--shadow);
    z-index: 20;
  }
  .site-header .site-nav[data-open="true"] {
    display: flex;
  }
  .site-header .site-nav a {
    padding: var(--s-2) var(--s-3);
    font-size: var(--fs-body);
    border-radius: var(--radius);
  }
  .site-header .site-nav a[aria-current="page"]::after {
    display: none; /* underline makes no sense inside a stacked panel */
  }

  .site-footer {
    flex-direction: column;
    gap: var(--s-3);
    align-items: flex-start;
  }
}

/* --- Reduced motion kill-switch (mandatory) -------------------------- */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}